Question

Mixotrophic nutrition occurs in
(a)Entamoeba
(b)Paramecium
(c)Giardia
(d)Euglena
(d)Both c and d

Answer 1

As the name suggests, mixotrophs are the organism that is capable of both types of nutrition, that is they behave as autotrophs and also feed another organism and act like heterotrophs. These types of organisms are found commonly in the kingdom Protista.

Complete answer:
A mixotroph is an organism having a mixotrophic mode of nutrition, which means they can use a mix of different sources of energy and carbon, that is by using photosynthesis for inorganic carbon fixation and by taking up organic sources. Mixotrophs comprise more than half of all microscopic plankton on the earth. The groups having many mixotrophic or heterotrophic taxa include cryptophytes, chrysophytes, dinoflagellates, euglenoid flagellates, and protozoans. Mixotrophy has a significant impact on the matter and energy flows in marine ecosystems.
-Giardia and Euglena show both heterotrophic and autotrophic mode of nutrition hence are called mixotrophs.
-Paramecium has a holozoic mode of nutrition, it feeds on microorganisms like bacteria, algae, and yeasts by using its cilia.
-Entamoeba has a holozoic mode of nutrition, it is a parasite that gets nutrition from the red blood cells and tissue cells of their host.
So, the correct answer is both 'c and d.'

Note: Holozoic nutrition is a type of heterotrophic nutrition in which an organism takes the complex organic food materials into its body by the process of ingestion; the ingested food is digested then and absorbed into the body cells of an organism. Due to its mixotrophic property and lack of cell wall, Euglena is considered as the link between plants and animals.